Change Details

**Motivation** The FileImporter asks users to add a category to a file, if there is none yet. However, often times files have hidden categories (e.g. due to their licence template), so the warning is not triggered. **Acceptance Criteria** [] Show the advice to add at least one category to the file, if there is no visible one yet. Hidden categories have no effect on the "category count".

**Motivation** The FileImporter asks users to add a category to a file, if there is none yet (implemented via T189573). However, often times files have hidden categories (e.g. due to their licence template), so the warning is not triggered. **Acceptance Criteria** [] Show the advice to add at least one category to the file, if there is no visible one yet. Hidden categories have no effect on the "category count".

**Motivation** The FileImporter asks users to add a category to a file, if there is none yet (implemented via T189573). However, often times files have hidden categories (e.g. due to their licence template), so the warning is not triggered. **Acceptance Criteria** [] Show the advice to add at least one category to the file, if there is no visible one yet. Hidden categories have no effect on the "category count".